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EP2487337A1 - Turbine à vapeur en construction à trois coquilles - Google Patents

Turbine à vapeur en construction à trois coquilles Download PDF

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Publication number
EP2487337A1
EP2487337A1 EP11154199A EP11154199A EP2487337A1 EP 2487337 A1 EP2487337 A1 EP 2487337A1 EP 11154199 A EP11154199 A EP 11154199A EP 11154199 A EP11154199 A EP 11154199A EP 2487337 A1 EP2487337 A1 EP 2487337A1
Authority
EP
European Patent Office
Prior art keywords
flow
turbomachine
steam
cooling steam
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11154199A
Other languages
German (de)
English (en)
Inventor
Tobias Hogen
Christoph Kästner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP11154199A priority Critical patent/EP2487337A1/fr
Priority to CN201180067356.1A priority patent/CN103370498B/zh
Priority to PCT/EP2011/073744 priority patent/WO2012107140A1/fr
Priority to EP11805032.7A priority patent/EP2652271A1/fr
Publication of EP2487337A1 publication Critical patent/EP2487337A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/26—Double casings; Measures against temperature strain in casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/14—Casings modified therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/70—Application in combination with
    • F05D2220/72—Application in combination with a steam turbine

Definitions

  • the invention relates to a turbomachine comprising a rotor rotatably mounted about a rotation axis, an inner inner housing arranged around the rotor in the radial direction and an outer inner housing, an outer housing being arranged around the inner inner housing and the outer inner housing, the turbomachine being designed for medium-pressure steam the first flood and a second flood formed for low pressure steam, wherein the second flood is aligned in the same direction as the first flood.
  • a steam turbine conventionally includes a rotatably mounted rotor and a housing disposed about the rotor. Between the rotor and the inner housing, a flow channel is formed.
  • the housing in a steam turbine must be able to fulfill several functions.
  • the guide vanes are arranged in the flow channel on the housing and, secondly, the inner housing must withstand the pressure and the temperatures of the flow medium for all load and special operating cases.
  • the flow medium is steam.
  • the housing must be designed such that inlets and outlets, which are also referred to as taps, are possible. Another feature that a case must meet is the possibility of a shaft end passing through the case.
  • nickel-base alloys are suitable because they withstand the stresses occurring at high temperatures.
  • the use of such a nickel-based alloy is associated with new challenges.
  • the cost of nickel-base alloys is comparatively high and, in addition, the manufacturability of nickel-base alloys, e.g. limited by limited casting possibilities.
  • the use of nickel-based materials must be minimized.
  • the nickel-based materials are poor heat conductors.
  • the temperature gradients over the wall thickness are so rigid that thermal stresses are comparatively high.
  • the medium-pressure part and the low-pressure part are housed in an outer housing.
  • the medium pressure part is supplied with a vapor, which usually has high steam parameters such as temperature and pressure and directly from the reheater unit flows from the high-pressure turbine section.
  • the effluent from the high-pressure part after expansion steam is fed to a reheater unit of a boiler and heated there to a higher temperature, which may correspond to the live steam temperature.
  • This reheated steam is then fed into the turbomachine in the medium-pressure part and then flows through a medium-pressure blading.
  • turbomachinery which are manufactured in a so-called single-flow design. In this design, the medium-pressure part and the low-pressure part is arranged one after the other and is flowed through in the same flow direction.
  • the inner housing is in this case formed in an inner inner housing and an outer inner housing.
  • the inner inner housing is located in the region of the inflow area and must therefore withstand the high temperatures and the high pressures. Therefore, the inner inner housing is made of a suitable material, such as a nickel-based alloy or a higher quality material such as a steel, which comprises 9 - 10 wt .-% chromium. Between the inner inner housing and the rotor of the flow channel is formed.
  • the inner inner housing therefore has means, such as grooves, for carrying vanes therein.
  • an outer inner housing is arranged around the inner housing.
  • the outer inner housing is designed such that, viewed in the flow direction, adjacent to the inner inner housing and a boundary of the flow channel, wherein also in the outer inner housing devices such as grooves, are provided to carry vanes can.
  • the outer inner casing is acted upon by vapor introduction into the cooling steam space with a steam having a lower temperature and a lower pressure, so that the material of the outer inner casing must be less heat-resistant than the material of the inner inner casing.
  • the outer inner housing is formed of a less high-quality material.
  • an outer housing is arranged around the inner inner housing and the outer inner housing.
  • the turbomachine has a first flow, which is acted upon by a medium-pressure steam and flows in a first flow direction. Furthermore, the turbomachine has a second flood, which is acted upon by low-pressure steam and flows in a second flow direction. The second flow direction points in the same direction as the first flow direction, so that this flow machine is designed in a so-called straight-flow design.
  • the medium-pressure inflow region is surrounded or formed by the inner inner housing.
  • the inner inner housing is made of a higher quality material and absorbs only the medium pressure inflow. As a result, the inner inner housing can be kept compact to save space and also has a lower weight.
  • a cooling steam space is formed between the inner inner housing and the outer inner housing.
  • the cooling steam in operation between the inner inner casing and the outer inner casing simultaneously constitutes the insulation for the outer inner casing, which encloses the cooling steam space and the inner inner casing and forms the expansion path behind the cooling steam extraction.
  • the outer inner housing is in contact to this cooling steam and can therefore be made or formed from a lower quality material than the inner inner casing.
  • the primary and secondary stresses in the outer inner casing are only affected by the difference between the vapor state of the vapor in the cooling steam space and the medium pressure exhaust steam.
  • Primary stresses are mechanical stresses that arise as a result of external loads, eg due to vapor pressures, weight forces and the like.
  • secondary voltages are meant, for example, thermoelectric voltages and represent mechanical stresses that arise as a result of unbalanced temperature fields or impediments to thermal expansion (thermal Verzwteil Heidelberg).
  • the turbomachine is formed, inter alia, in the cooling steam space with a drainage pipe, which at a standstill or startup drains an accumulating condensation water or ensures sufficient residual flow in case of failure of a tap, which could be exemplified by steam extraction via nozzles from the refrigerator.
  • a cooling steam flow line is provided for the flow of cooling steam into the cooling steam space.
  • the cooling steam flow line is advantageously fluidly connected to the second flow. This means that the low-pressure steam is predominantly flowed into the cooling steam space, which has ideal steam parameters, to adequately cool the inner inner casing.
  • cooling steam space is formed with adedampfausströmungstechnisch for flowing cooling steam from the cooling steam space. Due to the continuous operation of the cooling steam from the cooling steam space in the operation, a very good cooling is obtained, whereby the material utilization (in particular primary and secondary stresses) are lower in the turbomachine.
  • the rotor has a thrust balance piston, wherein a turbomachine cooling flow line is provided for the flow of cooling steam to the turbomachine.
  • the turbomachine cooling flow line is in this case advantageously fluidly connected to a cooling flow passage.
  • the inner inner housing is in this case made of a material of higher quality than the outer inner housing.
  • the inner inner housing is formed in a first embodiment of a sharkchromigen material comprising 9 - 10 wt .-% chromium formed.
  • the inner inner housing is formed of a nickel-based material.
  • the outer inner casing is formed of a material comprising 1 - 2 wt .-% chromium.
  • the steam turbine 1 is an embodiment of a turbomachine.
  • the steam turbine 1 comprises an outer housing 2, an inner inner housing 3, an outer inner housing 4 and a rotatably mounted rotor 5.
  • the rotor 5 is rotatably mounted about a rotation axis 6.
  • the outer housing 2 is made of an upper part and a lower part formed, wherein the upper part is shown above the axis of rotation 6 and the lower part below the axis of rotation 6 in the plane of the drawing.
  • Both the inner inner casing 3 and the outer inner casing 4 also have an upper part and a lower part which, as described for the outer casing 2, is arranged above and below the axis of rotation 6.
  • the inner inner casing 3, the outer inner casing 4 and the outer casing 2 each have a horizontal parting line.
  • a medium-pressure steam flows into a medium-pressure inflow region 7. Subsequently, the medium-pressure steam flows along a first flow direction 9 through a blading 8, not shown, which comprises guide vanes and rotor blades. The blades are hereby arranged on the rotor 5 and the guide vanes on the inner inner casing 3 and outer inner casing 4. The temperature and the pressure of the medium-pressure steam are reduced during the flow. The medium-pressure steam subsequently flows out of an outflow region 10 out of the turbomachine.
  • the inner inner casing 3 and the outer inner casing 4 are arranged around the rotor 5 in the radial direction 11.
  • the radial direction 11 is formed substantially perpendicular to the axis of rotation 6.
  • the outer casing 2 is arranged around the inner inner casing 3 and the outer inner casing 4, the outer casing 2 is arranged.
  • the inner inner housing 3 is formed in the region of the medium-pressure inflow region 7. Since in the medium-pressure inflow region 7, the temperature of the steam is highest, the inner inner housing 3 is made of a higher quality material.
  • the inner inner casing 3 is formed of a nickel-based alloy.
  • the inner inner casing 3 is formed of a higher grade material comprising 9-10 wt.% Chromium.
  • the outer inner housing 4 may be formed of a less high-quality material.
  • the inner outer casing 3 may be formed of a steel having 1-2% by weight of chromium.
  • the FIG. 2 shows a steam turbine 1 with an integrated medium-pressure part 12 and a low-pressure part 13.
  • the turbomachine 1 is in this case in a straight-flow design, ie, the steam flows both in the medium-pressure part 12 and in the low-pressure part thirteenth along a common flow direction.
  • the low pressure part 13 is formed between the rotor 5 and a low pressure inner casing 14.
  • the low-pressure part 13 is characterized by different steam parameters such as temperature and pressure compared to the medium-pressure part 12.
  • the turbomachine has a first flow 18 designed for medium-pressure steam and a second flow 19 designed for low-pressure steam, the second flow 19 being aligned in the same direction as the first flow 18.
  • the rotor 5 has a thrust balance piston, wherein a turbomachine cooling flow line is provided for flowing cooling steam of the turbomachine.
  • the outer inner housing 4 extends over the entire medium-pressure part 12. This means that the inner inner housing 3 is arranged in the region of the medium-pressure inflow region 7 within the outer inner housing 4. Between the inner inner casing 3 and the outer inner casing 4, a cooling steam space 16 is formed. This cooling steam space 16 is formed with a cooling steam flow line for flowing cooling steam. The cooling steam is taken from a low pressure blading 17 at a suitable location.
  • the inner inner housing 3 is thus relatively small and cost-saving and offers a broadening of the potential suppliers because of the low tonnage.
  • the cooling steam flowing out of the cooling steam chamber 16 again leads to a good cooling effect.
  • This outflowing cooling steam For example, can be guided by the outer inner housing 4 in a Abdampfraum or removed for example by a tap.
  • the inner inner housing 3 and the outer inner housing 4 are sealed against each other by means of seals.
  • a drainage line In the cooling steam chamber 16 is a drainage line, not shown, which dissipates an accumulating condensate at a standstill or startup of the steam turbine 1 or ensures sufficient residual flow in case of failure of the tap.
  • the inner inner housing 3, the outer inner housing 4 and the outer housing 2 are pressure-bearing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP11154199A 2011-02-11 2011-02-11 Turbine à vapeur en construction à trois coquilles Withdrawn EP2487337A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP11154199A EP2487337A1 (fr) 2011-02-11 2011-02-11 Turbine à vapeur en construction à trois coquilles
CN201180067356.1A CN103370498B (zh) 2011-02-11 2011-12-22 三壳结构形式的蒸汽轮机
PCT/EP2011/073744 WO2012107140A1 (fr) 2011-02-11 2011-12-22 Turbine à vapeur à triple enveloppe
EP11805032.7A EP2652271A1 (fr) 2011-02-11 2011-12-22 Turbine à vapeur à triple enveloppe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11154199A EP2487337A1 (fr) 2011-02-11 2011-02-11 Turbine à vapeur en construction à trois coquilles

Publications (1)

Publication Number Publication Date
EP2487337A1 true EP2487337A1 (fr) 2012-08-15

Family

ID=44259981

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11154199A Withdrawn EP2487337A1 (fr) 2011-02-11 2011-02-11 Turbine à vapeur en construction à trois coquilles
EP11805032.7A Withdrawn EP2652271A1 (fr) 2011-02-11 2011-12-22 Turbine à vapeur à triple enveloppe

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11805032.7A Withdrawn EP2652271A1 (fr) 2011-02-11 2011-12-22 Turbine à vapeur à triple enveloppe

Country Status (3)

Country Link
EP (2) EP2487337A1 (fr)
CN (1) CN103370498B (fr)
WO (1) WO2012107140A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115405380B (zh) * 2022-09-30 2025-03-07 上海电气电站设备有限公司 一种三层壳汽轮机中的冷却流道结构及汽轮机

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE420755C (de) * 1924-03-13 1925-10-31 Escher Wyss Maschf Ag Mehrstufige Dampf- oder Gasturbine fuer hohe Druecke mit Laufscheiben
GB662371A (en) * 1948-07-17 1951-12-05 Westinghouse Electric Int Co Improvements in or relating to steam turbine apparatus
GB773430A (en) * 1954-04-28 1957-04-24 Siemens Ag Improvements in or relating to steam turbines
DE3421067A1 (de) 1983-06-10 1984-12-13 Hitachi, Ltd., Tokio/Tokyo Hauptdampf-einlasseinheit fuer eine dampfturbine
JPH1089013A (ja) * 1996-07-23 1998-04-07 Fuji Electric Co Ltd 再熱式軸流蒸気タービン
DE10353451A1 (de) 2003-11-15 2005-06-16 Alstom Technology Ltd Dampfturbine sowie Verfahren zum Herstellen einer solchen Dampfturbine
DE102006027237A1 (de) 2005-06-14 2006-12-28 Alstom Technology Ltd. Dampfturbine
EP1925785A1 (fr) * 2006-11-22 2008-05-28 Siemens Aktiengesellschaft Dispositif de drainage de l'eau pour une turbine
EP2151547A2 (fr) * 2008-08-07 2010-02-10 Kabushiki Kaisha Toshiba Turbine à vapeur et système d'installation de turbine à vapeur
EP2216515A1 (fr) * 2009-02-10 2010-08-11 Siemens Aktiengesellschaft Turbine à vapeur à trois coques avec une soupape

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6752589B2 (en) * 2002-10-15 2004-06-22 General Electric Company Method and apparatus for retrofitting a steam turbine and a retrofitted steam turbine
JP4783053B2 (ja) * 2005-04-28 2011-09-28 株式会社東芝 蒸気タービン発電設備

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE420755C (de) * 1924-03-13 1925-10-31 Escher Wyss Maschf Ag Mehrstufige Dampf- oder Gasturbine fuer hohe Druecke mit Laufscheiben
GB662371A (en) * 1948-07-17 1951-12-05 Westinghouse Electric Int Co Improvements in or relating to steam turbine apparatus
GB773430A (en) * 1954-04-28 1957-04-24 Siemens Ag Improvements in or relating to steam turbines
DE3421067A1 (de) 1983-06-10 1984-12-13 Hitachi, Ltd., Tokio/Tokyo Hauptdampf-einlasseinheit fuer eine dampfturbine
JPH1089013A (ja) * 1996-07-23 1998-04-07 Fuji Electric Co Ltd 再熱式軸流蒸気タービン
DE10353451A1 (de) 2003-11-15 2005-06-16 Alstom Technology Ltd Dampfturbine sowie Verfahren zum Herstellen einer solchen Dampfturbine
DE102006027237A1 (de) 2005-06-14 2006-12-28 Alstom Technology Ltd. Dampfturbine
EP1925785A1 (fr) * 2006-11-22 2008-05-28 Siemens Aktiengesellschaft Dispositif de drainage de l'eau pour une turbine
EP2151547A2 (fr) * 2008-08-07 2010-02-10 Kabushiki Kaisha Toshiba Turbine à vapeur et système d'installation de turbine à vapeur
EP2216515A1 (fr) * 2009-02-10 2010-08-11 Siemens Aktiengesellschaft Turbine à vapeur à trois coques avec une soupape

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Y. TANAKA ET AL.: "Advanced Design of Mitsubishi Large Steam Turbines", MITSUBISHI HEAVY INDUSTRIES, POWER GEN EUROPE, 6 May 2003 (2003-05-06)

Also Published As

Publication number Publication date
CN103370498B (zh) 2016-06-08
CN103370498A (zh) 2013-10-23
WO2012107140A1 (fr) 2012-08-16
EP2652271A1 (fr) 2013-10-23

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